<dd>
<p>Negative numbers are used throughout the books. They are the numbers below zero. For example, if we have 1 and subtract 1 from it, we have 0. If we subtract 1 again, we have the next number below zero: <ch.minus/>1 (we call this negative 1). The minus sign before the one tells us that it is a negative number. If we subtract 1 yet again, we have <ch.minus/>2, and so on.</p>
<p>If we count from <ch.minus/>5 to 5, it looks like this: <ch.minus/>5, <ch.minus/>4, <ch.minus/>3, <ch.minus/>2, <ch.minus/>1, 0, 1, 2, 3, 4, 5. If we subtract 5 from 3, we get <ch.minus/>2. To see that this is true, start at 3 and count back 5 numbers.</p>
<dd>
<p>Negative numbers are used throughout the books. They are the numbers below zero. For example, if we have 1 and subtract 1 from it, we have 0. If we subtract 1 again, we have the next number below zero: <ch.minus/>1 (we call this negative 1). The minus sign before the one tells us that it is a negative number. If we subtract 1 yet again, we have <ch.minus/>2, and so on.</p>
<p>If we count from <ch.minus/>5 to 5, it looks like this: <ch.minus/>5, <ch.minus/>4, <ch.minus/>3, <ch.minus/>2, <ch.minus/>1, 0, 1, 2, 3, 4, 5. If we subtract 5 from 3, we get <ch.minus/>2. To see that this is true, start at 3 and count back 5 numbers.</p>